from django.conf import settings
from django.contrib.auth.models import AbstractUser
from django.db import models
from itsdangerous import TimedJSONWebSignatureSerializer, BadData

from areas.models import Areas
from meiduo_mall.utils.models import BaseModel
from users import constants


# Create your models here.


# 自定义的模型类，需要指定使用Django认证系统所使用的模型类


class User(AbstractUser):
    """创建用户模型类"""
    mobile = models.CharField(max_length=11, verbose_name='手机号')
    email_active = models.BooleanField(default=False, verbose_name='邮箱验证状态')
    # OneToOneField一对一关系 默认地址
    default_address = models.OneToOneField('Address', null=True, blank=True, on_delete=models.SET_NULL, related_name='addr_user', verbose_name='默认地址')
    class Meta:
        db_table = 'tb_users'
        verbose_name = '用户'
        verbose_name_plural = verbose_name

    def generate_verify_email_url(self):
        """
        生成验证邮箱的url
        """
        serializer = TimedJSONWebSignatureSerializer(settings.SECRET_KEY, expires_in=constants.VERIFY_EMAIL_TOKEN_EXPIRES)
        data = {'user_id': self.id, 'email': self.email}
        token = serializer.dumps(data).decode()
        verify_url = 'http://www.meiduo.site:8080/success_verify_email.html?token=' + token
        return verify_url

# 对邮箱返回的token进行校验
    @staticmethod  # 静态类方法
    def check_verify_email_token(token):
        """
        token 加密的信息
        """
        # 解密
        serializer = TimedJSONWebSignatureSerializer(secret_key=settings.SECRET_KEY)
        try:
            res_data = serializer.loads(token)
        except BadData:
            # 解密失败
            return None
        else:
            # 解密成功
            user_id = res_data['user_id']
            email = res_data['email']

            # 查询用户
            try:
                user = User.objects.get(id=user_id, email=email)
            except User.DoesNotExist:
                return None
            else:
                return user


class Address(BaseModel):
    """
    用户地址
    """
    user = models.ForeignKey(User, on_delete=models.CASCADE, related_name='addresses', verbose_name='用户')
    title = models.CharField(max_length=20, verbose_name='地址名称')
    receiver = models.CharField(max_length=20, verbose_name='收货人')
    province = models.ForeignKey(Areas, related_name='province_address', on_delete=models.PROTECT, verbose_name='省')
    city = models.ForeignKey(Areas, related_name='city_address', on_delete=models.PROTECT, verbose_name='市')
    district = models.ForeignKey(Areas, related_name='district_address', on_delete=models.PROTECT, verbose_name='区')
    place = models.CharField(max_length=50, verbose_name='地址')
    mobile = models.CharField(max_length=11, verbose_name='手机')
    tel = models.CharField(max_length=20, null=True, blank=True, default='', verbose_name='固定电话')
    email = models.CharField(max_length=30, null=True, blank=True, default='', verbose_name='电子邮箱')
    is_deleted = models.BooleanField(default=False, verbose_name='逻辑删除')

    class Meta:
        db_table = 'tb_address'
        verbose_name = '用户地址'
        verbose_name_plural = verbose_name
        ordering = ['-update_time']